Quote: "The L110 stage will operate at 6 per cent extra thrust throughout
the flight duration in the upcoming LVM3 D2 launch, compared to D1. The cryogenic
engine of the second stage will be improvised further with higher thrust."

Note: The planned use of the HPVE-1 engine on the D2 will obviously not occur
for technical reasons.

The Indian Space Research Organisation will develop
a new GSLV Mark III, its heaviest, tallest and most powerful rocket. The 42.4-metre-tall
rocket will have a lift-off weight of 630 tonnes and can put a four-tonne satellite
into the geo-synchronous transfer orbit (GTO) or a 10-tonne satellite into a low-earth
orbit. In comparison, the GSLV flight of May 8, belonging to the first generation
of GSLVs, put a 1.8-tonne satellite in the GTO. The GSLV Mark II can put 2.2- to
2.4-tonne satellites into the GTO.
GSLV Mark III is not derived from the Polar Satellite Launch Vehicle (PSLV) or the
presented GSLV. Although it is called Mark III, it is a totally new vehicle. Its
upper stage will be powered by a cryogenic engine developed at the Liquid Propulsion
Systems Centre (LPSC) at Mahendragiri in Tamil Nadu and codenamed C-25. It will
have 25 tonnes of propellants - liquid hydrogen and liquid oxygen - which will develop
a thrust of 20 tonnes.
Besides the cryogenic stage, GSLV Mark III has a core stage of two engines powered
by 110 tonnes of liquid propellants and two huge strap-on motors strung around the
core.
Each strap-on motor of the Mark III will be 3.4 metres in diameter and they will
be 25 metres tall. The challenge here is that India will develop a huge booster
with 200 tonnes of solid propellants, and a cryogenic stage with 25 tonnes of propellants.
The development work on Mark III began in October 2002. New facilities will be established
at Sriharikota and Mahendragiri to develop the solid boosters, the core liquid stage
and the cryogenic stage. A massive plant will come up at Sriharikota to produce
solid propellants for Mark III. This will be in addition to the existing Solid Propellant
Booster Plant (SPROB) facility at SHAR, one of the biggest plants of its kind in
the world. The private and public sector industries taking part in the project too
have to augment their facilities for the realisation of Mark III hardware.

GSLV-Mk.3 (LVM3) is the next generation launch vehicle of ISRO capable of delivering
4ton class spacecraft to Geo-synchronous transfer orbit. LVM3 is in the advanced
stage of development with the completion of static firing of the S200 solid strap-on
motor, stage testing of L110 liquid stage, completion of development tests of the
engine subsystems of the C25 cryogenic upper stage and development and qualification
tests of major sub-systems.
In S200, processing of large 100 tone solid propellant segment, flex nozzle system,
control actuators with blow down hydraulic power pack are the new developments.
In L110 stage twin-engine configuration with two-plane gimbal control is used. The
stage engineering being new, an integrated stage level test was conducted to demonstrate
the stage performance. The engine uses silica phenolic throat insert which demonstrated
an endurance of 240s of engien firing. C25 has a 200 kN engine operating in GG cycle.
The injector elements, gas generator, turbo-pumps and engine and stage modules are
developed and tested. The choice of GG cycle enables the testing of engine subsystems
separately in modules. The major tests scheduled are the integrated turbo-pump tests
and the testing of thrust chamber in pressure-fed mode before taking up the integrated
engine test by next year beginning.
The propellant tanks and stage structures of LVM3 are realised and qualification
tests are in progress. Structural load tests of L110 stage structures, propellant
tanks and base shrouds are completed. The composite payload fairing is 5 m in diameter
with 5m cylindrical length having 110m2 usable payload volume. The Payload fairing,
Equipment Bay structure and Payload Adaptor are realised and are in the process
of testing. The vehicle avionics and control systems are also of the new generation
with advanced redundancy management and failure protection. The system developments
are completed and are being inducted in the present vehicles and in LVM3 sub-assemblies.
Vibration and acoustic tests of assemblies, stage separation functional tests are
progressing. The ground resonance test (GRT) facilities for full vehicle configuration
have been commissioned.
The vehicle assembly & launch facilities, and spacecraft processing facilities are
ready and have been used for the stage preparations. No technology related challenges
are foreseen for the development of LVM3. The pacing activity for the launch of
LVM3 is the readiness of C25 stage.

LVM3 (GSLV-Mk.3)LVM3 is envisaged to launch four tonne satellite into geosynchronous transfer
orbit. LVM3 is a three-stage vehicle with a 110 tonne core liquid propellant stage
(L-110) and a strap-on stage with two solid propellant motors, each with 200 tonne
propellant (S-200). The upper stage will be cryogenic with a propellant loading
of 25 tonne (C-25). LVM3 will have a lift off weight of about 629 tonne and will
be 42.4 m tall. The payload fairing will have a diameter of 5 metre and a payload
volume of 100 cubic metre.

Vehicle Description
Boosters
The boosters used on the GSLV-III will be the S200, which is also designated Large
Solid Booster, or LSB, which is a solid propellant stage with a mass of 200 tonnes.
Two boosters will be used. Each has a diameter of 3.4 metres and a length of 25
metres. Each booster generates 517 tonnes-force (5.15 MN) of thrust at lift-off.
The Solid booster S-200 was successfully tested in January 2010.Core stage
The core stage will be the L110 restartable liquid stage which has 110 tonnes of
liquid propellant, a length of 17m in length
and 4m in diameter. It will be the first Indian
liquid engine cluster design, and will use two improved VIKAS engines, each producing
75 tonnes of thrust. The improved VIKAS engine will use regenerative cooling, providing
improved weight and specific impulse, compared to earlier rockets.Upper stage
The upper stage will be the C25, which is a cryogenic stage fuelled by 25 tonnes
of liquid oxygen and liquid hydrogen. It has a 4-metre diameter and is 8.2 metres
long. The stage will produce 20 tonnes of thrust.